Root trenching: a useful tool to estimate autotrophic soil respiration? A case study in an Austrian mountain forest

Díaz‐Pinés, Eugenio; Schindlbacher, Andreas; Pfeffer, Michael; Jandl, Robert; Zechmeister‐Boltenstern, Sophie; Sánchez, Alfonso Emilio Pérez

doi:10.1007/s10342-008-0250-6

Cited by 78 publications

(55 citation statements)

References 42 publications

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“…This result may be explained by the similar SOC stock (Table 2), mineral soil properties (total nitrogen, C/N and pH), T s , SWC (Table 3) and PLFA-based microbial biomass (unpublished data) between the two species. In addition, R h of the two species accounted for 45-68% of R s (Table 6), which was comparable to some boreal (Comstedt et al, 2011), temperate (Gaudinski et al, 2000;Díaz-Pinés et al, 2010) and subtropical forests (Yi et al, 2007;Q. Wang et al, 2013).…”

Section: Soil Co 2 Efflux and Components Of Native And Exotic Tree Spmentioning

confidence: 84%

“…⁎ Significant difference between the trenching and non-trenching treatments at P b 0.05 level. decomposition (Díaz-Pinés et al, 2010). Therefore, it is necessary to account for trenching-induced artifacts of the residual root decomposition and the absence of rhizodeposition in the future study.…”

Section: Trenching-and Topography-induced Artifacts and Uncertaintymentioning

confidence: 99%

“…However, trenching is a problematic method with three main known artifacts: 1) change in soil moisture mainly caused by the absence of transpiration (Comstedt et al, 2011), 2) residual root decomposition (Díaz-Pinés et al, 2010), and 3) potential decrease in heterotrophic activity due to the absence of rhizodeposition (Drake et al, 2012) in trenched plots. In our study, trenching-induced artifacts also arose.…”

Section: Trenching-and Topography-induced Artifacts and Uncertaintymentioning

confidence: 99%

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Soil organic carbon in deep profiles under Chinese continental monsoon climate and its relations with land uses

Wang

Shao

Zhang

et al. 2015

Ecological Engineering

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The selection of tree species is critical for soil organic carbon (SOC) stock and dynamics under afforestation. Exotic tree species were widely introduced and have been considered as a form of human-induced global change. However, how exotic tree species, as compared with native ones, affect SOC storage and soil respiration (R s ) has not been sufficiently investigated. Here we studied this issue in an even-aged (22 years) plantation composed by native Masson pine (Pinus massoniana Lamb.) (MP) and exotic slash pine (Pinus elliottii Engelm.) (SP) in subtropical China. A trenching method was used to partition R s into heterotrophic (R h ) and autotrophic respiration (R a ). R s and R h were measured approximately biweekly during August 2007 to December 2009. Our results showed that seasonal patterns of R s and R h in both pine forests were mainly affected by soil temperature and moisture (R 2 = 0.56-0.78, P b 0.001). There was no difference in SOC stock (forest floor + mineral soil of 0-40 cm), R h and turnover rate (R h /SOC stock) between MP and SP forests. However, annual R s , R a and R a /R s of MP were significantly 24%, 119% and 74% higher than those of SP, respectively. In contrast, even though MP and SP had similar fine and coarse root biomass, MP had significant higher ratios of R a /fine root biomass and R a /coarse root biomass than SP, suggesting a higher respiration rate in native pine species on a root biomass basis. We concluded that the exotic SP, as compared with indigenous MP, did not alter SOC stock, R h and turnover rate but depressed R a and R s . Therefore, both pine species were recommended in case of reforestation in terms of SOC sequestration.

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Section: Soil Co 2 Efflux and Components Of Native And Exotic Tree Spmentioning

confidence: 84%

Section: Trenching-and Topography-induced Artifacts and Uncertaintymentioning

confidence: 99%

Section: Trenching-and Topography-induced Artifacts and Uncertaintymentioning

confidence: 99%

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Soil organic carbon in deep profiles under Chinese continental monsoon climate and its relations with land uses

Wang

Shao

Zhang

et al. 2015

Ecological Engineering

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“…Comparability to studies from the boreal zone is limited due to the scarcity of studies but is within the range reported in studies from other zones, e.g. Epron et al (1999) for a beech forest in France (26 %) and Diaz-Pinez et al (2010) for a mixed spruce forest in Austria (30 % in the first two years) (see also review by Subke et al, 2006). An alternative approach to estimate the impact of trenched roots was applied by Comstedt et al (2011).…”

Section: Approach 2: On the Indirect Quantification Of The Neementioning

confidence: 95%

A fertile peatland forest does not constitute a major greenhouse gas sink

et al. 2013

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Abstract. Afforestation has been proposed as a strategy to mitigate the often high greenhouse gas (GHG) emissions from agricultural soils with high organic matter content. However, the carbon dioxide (CO 2 ) and nitrous oxide (N 2 O) fluxes after afforestation can be considerable, depending predominantly on site drainage and nutrient availability. Studies on the full GHG budget of afforested organic soils are scarce and hampered by the uncertainties associated with methodology. In this study we determined the GHG budget of a spruce-dominated forest on a drained organic soil with an agricultural history. Two different approaches for determining the net ecosystem CO 2 exchange (NEE) were applied, for the year 2008, one direct (eddy covariance) and the other indirect (analyzing the different components of the GHG budget), so that uncertainties in each method could be evaluated. The annual tree production in 2008 was 8.3 ± 3.9 t C ha −1 yr −1 due to the high levels of soil nutrients, the favorable climatic conditions and the fact that the forest was probably in its phase of maximum C assimilation or shortly past it. The N 2 O fluxes were determined by the closed-chamber technique and amounted to 0.9 ± 0.8 t C eq ha −1 yr −1 . According to the direct measurements from the eddy covariance technique, the site acts as a minor GHG sink of −1.2 ± 0.8 t C eq ha −1 yr −1 . This contrasts with the NEE estimate derived from the indirect approach which suggests that the site is a net GHG emitter of 0.6 ± 4.5 t C eq ha −1 yr −1 . Irrespective of the approach applied, the soil CO 2 effluxes counter large amounts of the C sequestration by trees. Due to accumulated uncertainties involved in the indirect approach, the direct approach is considered the more reliable tool. As the rate of C sequestration will likely decrease with forest age, the site will probably become a GHG source once again as the trees do not compensate for the soil C and N losses. Also forests in younger age stages have been shown to have lower C assimilation rates; thus, the overall GHG sink potential of this afforested nutrient-rich organic soil is probably limited to the short period of maximum C assimilation.

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“…Schaefer et al (2009) also demonstrated that autotrophic respiration occurred in a small proportion of a monsoon forest in China by their sophisticated manipulation experiment for separating root respiration. However, we may need to wait before drawing a conclusion because root trenching may have side effects such as root decomposition and changes in soil microbial community (Díaz-Pinés et al 2010).…”

Section: Variation Of Carbon Dioxide Sources In Different Slope Positmentioning

confidence: 99%

Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand

Takahashi

Hirai

Limtong³

et al. 2011

Soil Science and Plant Nutrition

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Soil respiration is a carbon flux that is indispensable for determining carbon balance despite variations over time and space in forest ecosystems. In Kanchanaburi, western Thailand, we measured the soil respiration rates at different slope positions-ridge (plot R), upper slope (plot U), and lower slope (plot L)-on a hill in a seasonal tropical forest [mixed deciduous forest (MDF)] to determine the seasonal and spatial variations in soil respiration on the slope. The heterotrophic (organic layer and soil) and autotrophic (root) respiration was differentiated by trenching. Soil respiration rates showed clear seasonal patterns: high and low rates in rainy and dry seasons respectively, at all plots, and tended to decrease up the slope. Soil respiration rates responded significantly to soil water content in the 0-30 cm layer, but the response patterns differed between the lower slope (plot L) and the upper slope (plots R and U): a linear model could be applied to the lower slope but exponential quadratic models to the upper slope. The annual carbon dioxide (CO 2 ) efflux from the forest floor was also associated with the slope position and ranged from 1908 gC m À2 year À1 in plot L to 1199 gC m À2 year À1 in plot R. With ascending position from plot L to R, the contribution of autotrophic respiration increased from 19.4 to 36.6% of total soil respiration, while that of the organic layer decreased from 26.2 to 9.4%. Mineral soil contributed to 46.3 to 54.4% of the total soil respiration. Soil water content was the key factor in controlling the soil respiration rate and the contribution of the respiration sources. However, the variable responses of soil respiration to soil water content create a complex distribution of soil respiration at the watershed scale.

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Root trenching: a useful tool to estimate autotrophic soil respiration? A case study in an Austrian mountain forest

Cited by 78 publications

References 42 publications

Soil organic carbon in deep profiles under Chinese continental monsoon climate and its relations with land uses

Soil organic carbon in deep profiles under Chinese continental monsoon climate and its relations with land uses

A fertile peatland forest does not constitute a major greenhouse gas sink

Topographic variation in heterotrophic and autotrophic soil respiration in a tropical seasonal forest in Thailand

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